<template>
  <div>
       <!-- 面包屑导航区域 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
  <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
  <el-breadcrumb-item>商品管理</el-breadcrumb-item>
  <el-breadcrumb-item>参数列表</el-breadcrumb-item>
</el-breadcrumb>
<!-- 卡片视图区域 -->
<el-card>
    <!-- 警告区域 -->
   <el-alert
    title="注意：只允许为第三级分类设置相关参数！"  show-icon
    type="warning" :closable="false">
  </el-alert>
  <!-- 选择商品分类区域 -->
  <el-row class="cat_opt">
      <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
           <el-cascader
    v-model="selectedCateKeys" :props="cateProps"
    :options="catalist"
    expand-trigger= "hover" 
    @change="handleChange"></el-cascader>

      </el-col>
  </el-row>
  <!-- tab页签区域 -->
    <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
    <el-tab-pane label="动态参数" name="many">
    <el-button type="primary" size="mini" 
    :disabled="isBtnDisabled" @click="addDialogVisible=true">
        添加参数</el-button>
        <!-- 动态参数表格 -->
        <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
             <el-table-column type="expand">
                 <template slot-scope="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag closable v-for="(item, index) in scope.row.attr_vals" :key="index" 
                @close="handleClosed(index, scope.row)"> {{ item }}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
             </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button size="mini" type="primary" 
                  icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button size="mini" type="danger" 
                  icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
            </el-table-column>
        </el-table>
    </el-tab-pane>
        <!-- 添加静态属性的面板 -->
    <el-tab-pane label="静态属性" name="only">
        <!-- 添加属性按钮 -->
 <el-button type="primary" size="mini" :disabled="isBtnDisabled"
 @click="addDialogVisible=true">添加属性
      </el-button>
      <!-- 静态属性表格 -->
        <el-table :data="onlyTableData" border stripe>
           <!-- 展开行 -->
             <el-table-column type="expand">
                 <template slot-scope="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag closable v-for="(item, index) in scope.row.attr_vals" :key="index" 
                @close="handleClosed(index, scope.row)"> {{ item }}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
             </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button size="mini" type="primary"
                   icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button size="mini" type="danger" icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
            </el-table-column>
        </el-table>
      </el-tab-pane>
  </el-tabs>
</el-card>
<!-- 添加参数的对话框 -->
<el-dialog
  :title="'添加'+titleText"
  :visible.sync="addDialogVisible"
  width="50%" @close="addDialogClosed">
  <!-- 添加参数的对话框 -->
 <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="addForm.attr_name"></el-input>
  </el-form-item></el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
</el-dialog>
<!-- 修改参数的对话框 -->
<el-dialog
  :title="'修改'+titleText"
  :visible.sync="editDialogVisible"
  width="50%" @close="editDialogClosed">
  <!-- 修改参数的对话框 -->
 <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="editForm.attr_name"></el-input>
  </el-form-item></el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
</el-dialog>
  </div>
</template>

<script>
export default {
    data(){
        return{
        //   商品分类列表
        catalist:[],
        // 级联选择框的配置对象
        cateProps:{
            value:'cat_id',
            label:'cat_name',
            children:'children'
        },
        //级联选择框双向绑定到的数组
        selectedCateKeys:[],
        // 被激活的页签的名称
        activeName:'only',
        // 动态参数的数据
        manyTableData:[],
        // 静态属性的数据
        onlyTableData:[],
        // 控制添加对话框的显示与隐藏
        addDialogVisible:false,
        // 添加参数的表单数据对象
        addForm:{
            attr_name:''
        },
        // 添加表单的验证规则对象
        addFormRules:{
            attr_name:[
                {required:true,message:'请输入参数名称',trigger:'blur'}
            ]
        },
        // 控制修改对话框的显示与隐藏
        editDialogVisible:false,
        // 修改的表单数据对象
        editForm:{},
        // 修改表单的验证规则对象
        editFormRules:{
             attr_name:[
                {required:true,message:'请输入参数名称',trigger:'blur'}
            ]
        },
        // 控制按钮与文本框的切换显示
        inputVisible:false,
        // 文本框中输入的内容
        inputValue:''
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        // 获取所有的商品分类列表
      async  getCateList(){
            const {data:res}=await this.$http.get('categories')
      if(res.meta.status!==200){ 
             return this.$message.error('获取商品分类失败！')
        }
        this.catalist=res.data
        console.log(this.catalist)
        },
        // 级联选择框选中项变化，会触发这个函数
        handleChange(){
            this.getParamsData()
        },
        // tab页签点击事件的处理函数
        handleTabClick(){
            console.log(this.activeName)
            this.getParamsData()
        },
        // 获取参数的列表数据
    async getParamsData() {
        this.selectdCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        
      
      // 证明选中的是三级分类
      // console.log(this.selectdCateKeys)
      // 根据所选的分类的ID,和当前所处的面板,获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: { sel: this.activeName }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败!')
      }
      // 获取Tag的数据分割为数组
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示和隐藏
        item.inputVisible = false
        item.inputValue = ''
      })
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
      console.log(res.data)
    },
        // 监听添加对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        //点击按钮，添加参数
        addParams(){
          this.$refs.addFormRef.validate(async valid=>
          {
              if(!valid) return 
           const {data:res}=await  this.$http.post(`categories/${this.cateId}/attributes`,{
                  attr_name:this.addForm.attr_name,
                  attr_sel:this.activeName
              })
              if(res.meta.status!==201){ 
             return this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数成功！')
        this.addDialogVisible=false
        this.getParamsData()
          })
        },
        //点击按钮，展示修改的对话框
       async showEditDialog(attr_id){
            // 查询当前参数的信息
           const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
            {params:{attr_sel:this.activeName}})

            if(res.meta.status!==200){ 
             return this.$message.error('获取参数信息失败！')
        }
            this.editForm=res.data
            this.editDialogVisible=true
        } ,
         // 重置修改的表单
        editDialogClosed(){
           this.$refs.editFormRef.resetFields()
        },
        // 点击按钮，修改参数信息
       editParams(){
           this.$refs.editFormRef.validate(async valid=>{
                if(!valid) return
             const {data:res}=await this.$http.put(
                 `categories/${this.cateId}
            /attributes/${this.editForm.attr_id}`,
            {attr_name:this.editForm.attr_name,
            attr_sel:this.activeName})
        
            if(res.meta.status!==200){ 
             return this.$message.error('修改参数失败！')
        }
         this.$message.success('修改参数成功！')
         this.getParamsData()
         this.editDialogVisible=false})
        },
        // 根据id删除对应的参数项
       async removeParams (attr_id){
     const confirmResult=await   this.$confirm('此操作将永久删除此参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err=>err)
        // 用户取消了删除的操作
        if(confirmResult!=='confirm'){
            return this.$message.info('已取消删除！')
        }
        // 删除的业务逻辑
       const {data:res}=await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
            if(res.meta.status!==200){ 
             return this.$message.error('删除参数失败！')
        }
        this.$message.success('删除参数成功！')
        this.getParamsData()
        },
        // 文本框失去焦点和回车触发
     handleInputConfirm(row) {
      console.log('ok')
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return证明内容合法做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 需要发送请求,保存
      this.saveAttrVals(row)
    },
     // 点击按钮显示文本输入框
    showInput(row) {
      row.inputVisible = true
      // 自动获取焦点
      // $nextTick 方法作用: 当页面上的元素被重新渲染之后,才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // Tag标签的删除
    handleClosed(index, row) {
      row.attr_vals.splice(index, 1)
      this.saveAttrVals(row)
    },
    async saveAttrVals(row) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_sel: this.activeName,
        attr_name: row.attr_name,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败!')
      }
      this.$message.success('修改参数项成功!')
    },
    },
    computed:{
        // 如果按钮需要被禁用，则返回true，否则返回false
        isBtnDisabled(){
            if(this.selectedCateKeys.length!==3){
                return true
            }
            return false
        },
        // 当前选中的三级分类的id
        cateId(){
            if(this.selectedCateKeys.length===3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题的文本
        titleText(){
            if(this.activeName==='many'){
                return '动态参数'
            }
            return '静态属性'
        }
       
    }

}
</script>

<style lang="less" scoped>
.cat_opt{
    margin:15px 0;
}
.el-tag{
    margin:10px;
}
.input-new-tag{
    width:120px;
}

</style>